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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Mam·mal n.; pl. Mammals   Zool. One of the Mammalia.
 Age of mammals. See under Age, n., 8.
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From: WordNet (r) 2.0

 Age of Mammals
      n : approximately the last 63 million years [syn: Cenozoic, Cenozoic
           era]